# Math Help - vague concept on potential

1. ## vague concept on potential

Hi ,
i have a question I dont know how to answer:

Explain why the potential integral formula cannot be used to directly determine the potential from an infinite uniform line charge ρlo that is on the z axis.

When we talk about it in class, I learn that the potential integral was used for finite displacement. I read the textbook but I did not have other information.

So I there other reason to answer this question? This concept of infinity is a little vague for me.
B.

Hi ,
i have a question I dont know how to answer:

Explain why the potential integral formula cannot be used to directly determine the potential from an infinite uniform line charge ρlo that is on the z axis.

When we talk about it in class, I learn that the potential integral was used for finite displacement. I read the textbook but I did not have other information.

So I there other reason to answer this question? This concept of infinity is a little vague for me.
B.
Where is the reference point (that is, where is the potential function equal to 0) for this problem?

-Dan

3. Originally Posted by topsquark
Where is the reference point (that is, where is the potential function equal to 0) for this problem?

-Dan
The convention says at infinity V=0[V].